SPONGES. 
17 
Those from the beach are loaded with sand, spines of the 
common and purple heart urchins, bristles of the sea-mouse; 
and many starfishes seek refuge in their interstices. 
Chalina limbata, Bowerb.; vol. ii. p. 373. 
Not uncommon under stones in tidal pools, either coating 
the surface of the stone or attached to the stems of Corallina 
officinalis. 
1 ) 
